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cladeymoore · 4 years ago

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The art of a seamless migration of Coinbase’s internal ledger

Lessons learned from a large cross-database data migration on a critical production system

By Alex Ghise, Staff Software Engineer

If you’re interested in distributed systems and building reliable shared services to power all of Coinbase, the Platform team is hiring!

In 2019, Coinbase set out to strengthen the infrastructure upon which its products are built and to create a solid foundation to support current and future product lines. As part of that effort, we decided to adopt AWS RDS PostgreSQL as our database of choice for relational workloads and AWS DynamoDB as our key-value store.

One of the first areas we decided to focus on was how to keep track of balances and move funds. Our products had each devised their own solutions and some legacy systems were also plagued by tech debt and performance issues. The ability to quickly and accurately process transactions is central to Coinbase’s mission to build an open financial system for the world.

We designed and built a new ledger service to be fast, accurate and serve all current and future needs across products and have undertaken our biggest migration as of yet, moving over 1 billion rows of corporate and customer transaction and balance information from the previous data storage to our new PostgreSQL-based solution, without scheduled maintenance and no perceptible impact to users.

Our key learnings:

Make it repeatable — You may not get it right the first time.

Make it fast — So you can quickly iterate.

Make it uneventful — By designing the process so that it runs without disrupting normal business operations.

Here’s how we did it…

Migration Requirements

Accuracy and Correctness: Since we’re dealing with funds, we knew this would be a very sensitive migration and wanted to take every precaution, make sure that every last satoshi is accounted for.

Repeatable: Additionally, the shape of our data was completely different in the new system vs the legacy system. Further, we had to deal with technical debt and cruft accumulated over time in our monolithic application. We knew we needed to account for the possibility of not getting everything right in a single go, so we wanted to devise a repeatable process that we could iterate on until getting it right.

No Maintenance Downtime: We wanted every transaction on Coinbase to execute while working on this. We didn’t want to do any scheduled maintenance or take any downtime for the transition.

The Setup

We can deconstruct the migration into 2 separate problems: Switching live writes and reads over the new service, and migrating all of the historical data into the new service.

For the migration we decided to take a dual-write / dual-read phased approach. Phase 1 is before the migration, where we only have the legacy system in place. In Phase 2, we introduce the new system. We dual write to both the legacy and new system the read path we read from both, then log discrepancies and return the result from the legacy system. With Phase 3, we’ve built up the confidence in our new setup, so we favor it when returning results. We still have the old system around and can switch back to it if needed. Finally, we phase out unused code to finish the migration (Phase 4).

We won’t go into details about our dual-write implementation, since the general idea has been previously covered by industry blog posts.

What’s interesting is something that happens in between Phase 2 and Phase 3, namely the backfill of all customer data into our new system so that we can achieve parity.

The Repeatable Backfill Process

We considered multiple approaches to backfilling the billion-plus rows that represent all the transactions carried out on Coinbase from its inception, all with pros and cons.

The most straightforward solution would have been to do it all at the application level, leveraging the ledger client implementation we had in place for the dual writes. It has the advantage of exercising the same code paths we have in place for live writes — there would be a single mapping from old to new to maintain. However, we would have had to modify the service interface to allow for the backfill and we would have had to set up long running processes together with a checkpointing mechanism in case of failure. We also benchmarked this solution, and found that it would be too slow to meet our requirements for fast iteration.

We eventually decided to pursue an ETL-based solution. At a high level, this entailed generating the backfill data from the ETL-ed source database, dumping it into S3 and loading it directly into the target Postgres database. One key advantage to this approach is that doing data transformation using SQL is fast and easy. We could run the entire data generation step in ~20 minutes, examine the output, verify internal consistency and do data quality checks directly on the output without having to run the entire backfill pipeline.

Our data platform provider offers a variety of connectors and drivers for programmatic access. This means that we could use our standard software development tools and lifecycle — the code that we wrote for the data transformation was tested, reviewed and checked into a repository.

It also has first-class support for unloading data into S3, which made it easy for us to export the data after provisioning the appropriate resources.

One the other end, AWS provides the aws_s3 postgres extension, which allows bulk importing data into a database from an S3 bucket. Directly importing into live, production tables however proved problematic, since inserting hundreds of millions of rows into indexed tables is slow, and it also affected the latency of live writes.

We solved this problem by creating unindexed copies of the live tables, as follows:

DROP TABLE IF EXISTS table1_backfill cascade;

CREATE TABLE table1_backfill (LIKE table1 INCLUDING DEFAULTS INCLUDING STORAGE);

The import now becomes limited by the I/O, which becomes a bottleneck. We ended up slowing it down a bit by splitting the data into multiple files and adding short sleep intervals in between the sequential imports.

Next up, recreating the indexes on the tables. Luckily, Postgres allows for index creation without write-locking the table, by using the CONCURRENT keyword. This allows the table to continue taking writes while the index is being created.

So far, so good. The real complexity however comes from our requirement to have a migration that doesn’t involve scheduled maintenance or halting transaction processing. We want the target database to be able to sustain live writes without missing a single one, and we want the backfilled data to seamlessly connect to the live data. This is further complicated by the fact that every transaction stores information about the cumulative balances of all accounts involved — this makes it easy for us to evaluate and maintain data integrity and to look up point in time balances for any account at any timestamp.

We solved for this by using triggers that replicate inserts, updates, deletes to the live tables into the backfill tables. Our concurrent index generation allows us to write to these tables while the indexes are being created.

After indexing is complete, in a single transaction, we flipped the backfill and live tables, drop the triggers, and drop the now unneeded tables. Live writes continue as if nothing happened.

At the end of this process, we run another script that goes through all of the data and restores data integrity by recreating the cumulative balances and the links between sequential transactions.

Last but not least, we run another round of integrity checks and comparisons against the legacy datastore to make sure that the data is correct and complete.

Putting it all together, the sequence looks as follows:

Clean slate: reset ledger database, start dual writing

Wait for dual written data to be loaded into ETL, so that we have overlap between live written data and backfill data.

Generate backfill data, unload it into S3

Create backfill tables, set up triggers to replicate data into backfill tables.

Import data from S3

Create indexes

Flip tables, drop triggers, drop old tables.

Run repair script

Verify data integrity, correctness, completeness

The process would take 4 to 6 hours to run and was mostly automated. We did this over and over while working through data quality issues and fixing bugs.

The Aftermath

Our final migration and backfill was not a memorable one. We didn’t have a “war room”, no standby on-call engineers, just another run of our process after which we decided that it was time to flip the switch. Most people within the company were blissfully unaware. An uneventful day.

We’ve been live with the ledger service for almost a year now. We have the capacity to sustain orders of magnitude more transactions per second than with our previous system, and with tight bounds on latency. Existing and new features, such as the Coinbase Card, all rely on the ledger service for fast and accurate balances and transactions.

If you’re interested in distributed systems and building reliable shared services to power all of Coinbase, the Platform team is hiring!

This website contains links to third-party websites or other content for information purposes only (“Third-Party Sites”). The Third-Party Sites are not under the control of Coinbase, Inc., and its affiliates (“Coinbase”), and Coinbase is not responsible for the content of any Third-Party Site, including without limitation any link contained in a Third-Party Site, or any changes or updates to a Third-Party Site. Coinbase is not responsible for webcasting or any other form of transmission received from any Third-Party Site. Coinbase is providing these links to you only as a convenience, and the inclusion of any link does not imply endorsement, approval or recommendation by Coinbase of the site or any association with its operators.

All images provided herein are by Coinbase.

The art of a seamless migration of Coinbase’s internal ledger was originally published in The Coinbase Blog on Medium, where people are continuing the conversation by highlighting and responding to this story.

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kivircikedebiyatii · 6 years ago

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The 7 Common Stereotypes When It Comes To SEO 2019

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seattle-fog · 6 years ago

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What's So Trendy About SEO 2019 That Everyone Went Crazy Over It?

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bluebookweb · 7 years ago

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What To Look For in Servers for POS Systems

Hospitality and retail companies face numerous hardware challenges in their highly competitive and ever-changing environments. They need highly-configurable and cost-effective point-of-sale (POS) systems that are secure and reliable.

In selecting the right server for their POS system, they should look for platforms with three key characteristics: consistency, long server life, and the ability to handle multiple needs simultaneously to drive down costs.

Server as POS Backbone

A point-of-sale (POS) system means different things to different people – there is no one definitive POS configuration. Many technologies roll up into a typical solution, including networking, in-store Internet access, multi-function POS devices, customer kiosks, digital signage, hand held devices, as well as back office servers connected to a data center in cloud.

The back end server remains the backbone of the POS solution.

POS configurations and hardware tend to vary among three general application categories: table/hospitality/restaurants; retail (convenience store/grocery/chain); and medical (including dental and veterinary). In general, POS technology has shifted from closed proprietary solutions to more flexible solutions that give the retailer or restaurant owner better control and understanding of store operations. Most recently, POS solutions have begun to provide direct interaction with the customers, for example, tablets for ordering and paying.

While not as glamorous as these new tools and toys, the back end server remains the backbone of the POS solution. Depending upon the application, servers can provide multiple functions – a terminal, digital signage player, and a back office PC.

It should be noted that there is nothing innately different in a server used for a POS system than one for other industry verticals. There are some unique features, like connectivity and providing the required number of ports, but at its heart it is no different than a normal server. What makes a difference is the ability of the customer server platform to meet the required level of control over operations.

Rely on a Server Expert

Many resellers rely on large industry players like ScanSource for terminals, handheld devices, cash drawers, printers, power products, and other peripherals. While these POS giants may also offer backend servers, resellers frequently recommend that customers instead obtain their servers from a server expert. Many resellers are uncomfortable with buying their servers from the same vendor from whom they buy their cash drawers. Resellers should be looking for servers that are not tied into any particular software or hardware. Look for a vendor that has experience building cost effective servers for all POS applications. The focus should be on close interactions with resellers and a high level of customer service that allows each reseller to customize and configure exactly what their end users need.

Sometimes an end user company wants to use RAID (array of independent disks), or perhaps they want multiple network cards because they have an internal network and a credit card network that must be kept separate. Or they want to run Windows 7 on their server and have found that larger server manufacturers do not offer servers with desktop software.

Look for hardware product managers who work with each reseller to determine the required specifications and review the server hardware configuration options available. With this approach, resellers maintain an enormous amount of control over the server product they procure. Acting as a co-developer, product managers should come up with a POS server solution based on resellers’ unique technology, sales, and customer preferences.

Cost Reductions

For many POS end users, there is a distinct cost advantage to selecting servers that are approved to run both the desired POS software and a desktop operating system on a server platform. This can be especially beneficial for companies running on slim margins. Rather than having to purchase sophisticated servers and other hardware resources, they can combine functions into one piece of hardware and save significant dollars. The ability to provide a platform server with a desktop operating system means end users do not have to support multiple different platforms.

This makes a lot of sense, since in many instances there is no real need for complicated servers – these are just machines that are connected. No one is logging in, there is no active directory, and no need for replication and directory services. The servers simply need to share some files. So, the server side has minimal requirements. But – and it is a big but – end users still need the reliability a server can give, since desktop computers are not designed to run 24/7, with multiple hard drives.

There are many examples of POS resellers experiencing frustration with larger server manufacturers who do not know enough about the ins and outs of the POS business to be able to help them select the right server. Price and product availability may vary from month to month, or even week to week. Resellers have no control over which hard drives or video cards will ultimately end up in their servers.

Server experts should be enable resellers to lock down the precise unique configurations they are looking for, while still providing pricing competitive with major manufacturers.

Standardization Removes Risks

Standardization means providing the fewest number of product views to cover the greatest number of solutions. Some vendors have developed solutions in which the end user customers may get three to four boxes, all using one motherboard/platform, or at most two platforms.

Standardization means providing the fewest number of product views to cover the greatest number of solutions.

One might be in a smaller case, used up front at a checkout. One might be a workstation, like a low end back office server that can also be used by the restaurant manager for other tasks. This experience means end users can get the unique configuration they need while removing the risks inherent in customizing each server – like learning that one or another USB or network card does not work as required.

A huge advantage of this approach is that the end user does not have to support four different separate computers, each on different road maps. The need to support multiple images can be frustrating, as can the need to maintain multiple stacks of inventory for spare parts. Hardware product managers work directly with Intel, motherboard manufacturers, case designers, and component manufacturers, to lay out very detailed road maps and life cycles that resellers can count on.

Threat Management and Security Concerns

Security is one of the most important issues facing POS end users. Most are already compliant with Payment Card Industry Data Security Standard (PCI DSS) requirements, but there are many other aspects of threat management and security now being integrated into POS systems, albeit slowly.

Unfortunately, POS systems are lagging behind in security technology. The reasons are twofold: resellers do not like change and store owners balk at spending money on technology, running as they do on thin margins. Software companies have had to embrace these security measures and update their software, so they are starting to come around to the need for change. As they do so, resellers will also evolve to meet end user customer requirements.

There is a trend towards virtualization as a way of providing a higher level of security on back end operations. Virtualization is an excellent way of securing the POS environment, especially for those with multiple locations. Virtual servers by their nature are very secure. All vendors now want to secure credit cards, using mobile payment and digital wallet services, and to do so they will need secure virtual machine (VM) servers with hardened operating systems.

It should be noted that the lack of “appetite” for buying new technology was greatly exacerbated by the 2008 market crash, which affected restaurants and retail stores very badly. After many years in the doldrums, there has been a resurgence in sales. This already seems to be leading to an increase in purchase of virtualized infrastructure, with the security improvements that go with it.

Another trend that is having a major effect on security is the move to cloud-based, rather than local, infrastructure. In the past, if someone walked into a fast food restaurant and grabbed a computer and walked out the back door, the thief would be able to obtain an enormous amount of information. Many now still have a computer on premise – but it does not house information; it has all been stored with the credit card processors.

Resellers Can Provide What End Users Need

POS resellers need to be able to customize cost-effective servers that are stable, with long life performance, and managed technology roadmaps. Look for platforms that have been field-tested with the top-selling POS software packages, so resellers have access to a variety of computer server building blocks to provide winning end user solutions.

What To Look For in Servers for POS Systems posted first on happyhourspecialsyum.blogspot.com

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binaryscamalert-blog · 7 years ago

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BDSwiss Review - a Scam or Legit Online Binary Options Broker?

New review has been published on https://binaryscamalert.com/review/bdswiss/

BDSwiss Review - a Scam or Legit Online Binary Options Broker?

First a bit about the company

BDSwiss (Banc De Swiss) is a subsidiary of the BDSwiss holding PLC which was founded in 2012. This online binary options broker is regulated by the Cyprus Securities and Exchange Commission (Cy SEC) and holds license number 199/3. It’s a Cyprus based company whose registered address is 23, Spyrou Kyprianou Avenue. Their main office is on the third floor of the Protopapas Building in Limassol Cyprus. The broker also has a contact address in Frankfurt, Germany although this is for receiving mail only.

Other than CySEC BDSwiss is also registered with the US National Features Association (NFA). This however doesn’t mean that the NFA actually regulates the broker. The company therefore doesn’t offer its services to traders from the US and Canada. In December 2016, BDSwiss became authorized and regulated as an investment dealer by the Financial Securities Commission (FSC).

BDSwiss a scam or legit online binary options broker?

BDSwiss is fully regulated by CySEC, one of the best known financial regulators in the world today. Although founded in 2012 and considered one of the fairly new brokers in the industry, BDSwiss has built a reputation for being a reliable and transparent broker. In 2015, BDSwiss received the “Most Reliable Broker” award, an honor bestowed by fellow brokers around the world.

Being registered with the NFA is another indicator that BDSwiss is a scam broker and worth investing with them.

What makes BDSwiss stand out?

One of things that make BDSwiss stand out is that it’s regulated by CySEC as well as registered with the NFA. The website has undergone some transformation recently. Besides the good old binary options, BDSwiss has also included FX/CFD trading modules (which seems like their main focus). However, traders can buy and sell binary options as well as FX/CFDs from a single account.

#9 Rated Binary Option Broker 2017 Broker Regulation Rating Account CySEC Start Trading

What are the downsides of BDSwiss?

The website makeover was good. However, it still needs some tweaking to make it easier to use. The broker also charges withdrawal fees which we found cuts into your earnings. However, the fee is quite fair compared to the cut many competing brokers take from trader earnings.

Should you open a trading account with BDSwiss?

Many online binary options brokers are seeking to be registered with recognized regulators. This earns them the trust of would be traders looking to invest their money. As a trader, investing your money with a regulated broker gives you peace of mind that your funds are insured and you can get compensated in case the broker goes under. However, being regulated isn’t all that you should look for in a broker. BDSwiss has made huge strides towards ensuring that traders can easily use their platform to make money.

The website includes a courses section which contains learning resources you can use to know how to trade. The learning resources are well presented and you can actually mark a lesson as complete. The learning resources also include webinars which allow you to learn from professional traders as well as remain in the loop about what’s happening in the financial markets. You also have access to a variety of charts and indicators right from your account interface making it easy to keep track of specific price movements.

BDSwiss USA Traders

Being registered with the NFA is worth mentioning again. It’s very rare to find a broker that primarily offers services to European traders registered with this organization. However, the NFA doesn’t actually regulate BDSwiss since the broker doesn’t accept traders from the US. In addition, to this BDSwiss has made efforts to continue building trust with traders and actually became recognized and regulated by the FSA in 2016.

Opening an account with BDSwiss allows you to trade both binary options as well as FX/CFDs. Rather than have two separate accounts; you can easily access binary options and FX/CFDs from a single account. That makes it easier to trade since you don’t need to keep logging in and out of your account to trade. The platform is built upon the SpotOption software (binary options) and the metatrader4 software for FX/CFD trading. The stability of these platforms makes it easy to make trades fast.

World Wide access

Primarily targeting traders from Europe and Asia, the BDSwiss website is available in over 19 languages including English, Swiss, Hindi, Arabic, Korean, Malay, Thai and German. This makes it easily accessible from traders across Europe and other parts of the world.

Customer support is one of the main features to look at before deciding whether to invest with a particular broker. BDSwiss has invested in a professional and multilingual customer support team ready to help solve trader’s problems. Their customer support staff is accessible via email, phone, Skype or live chat. If you fancy sending mail, they also provide a PO Box located in Germany. Their customer support isn’t restricted to solving problems you might encounter while using their platform. BDSwiss has also invested in learning materials and tools to enable you become a better trader.

#9 Rated Binary Option Broker 2017 Broker Regulation Rating Account CySEC Start Trading

Traders looking to diversify their portfolio by investing in a variety of assets will find BDSwiss a good place to invest their money. Once you open an account, you’ll have access to over 230 tradable assets which include currency pairs, stocks, commodities and indices. They also offer a variety of trade types which give you more control over how long to hold a trade and potential profit you can make. These include one-touch, the classic high/low, ladders and turbo trading.

Maximizing profitability of a trade has also been made possible through different unique features. For example, you’ll have access to the double-up feature which allows you to make twice the anticipated profit on a trade. It’s however worth noting that if there’s a potential to double your profits on a trade, there’s also the potential to incur twice the loss. So it’s always important that you only trade with an amount you’re willing to lose.

Opening a Trader account by Banc de Swiss

Opening a trading account with BDSwiss is quite easy. Besides identification documents, all you need to do is deposit USD or EUR 100 into your account to start trading. You also have access to a demo account which makes it easy to practice trading using the platform. Although you don’t need to download anything, we didn’t like how much personal information you’re required to provide in order to use the demo account. The platform is generally well built with intuitive sections which are easy to figure out. It’s also accessible via mobile devices running on different operating systems.

The Bonus

Bonuses are one way that unscrupulous binary options brokers lure unsuspecting traders into opening accounts and depositing money (although some legit brokers use this strategy too). Since BDSwiss is fully regulated by CySEC, they’re not permitted to announce any bonuses offered as a way of advertising their service. However, we contacted their customer support team to inquire whether they offer bonuses and were told that the broker regularly holds contests and promotions.

Like many online binary options brokers, BDSwiss accepts different payment methods which include wire transfer, credit card and e-wallet. This makes it convenient to deposit and withdraw money from your account. Withdrawals might incur a fee in certain situations. For example, withdrawing less than $500 from your account will attract a $25 withdrawal fee.

How much you can earn on a trade largely depends on the assets you’re buying and selling. For binary options, you can earn as much as 85% effective return on a successful trade. One touch trades can earn you up to 600% effective return. When trading FX/CFDs, BDSwiss will offer you leverage of up to X400 and pips as low as 1.2 to maximize on your profits.

Trader complaints

BDSwiss has been around since 2012. While conducting our research, we found that it hasn’t attracted any serious trader complaints. But we’ll keep an eye out for any complaints that might surface in the future.

BD Swiss regulator warnings and legal action

In 2015, BD Swiss was fined EUR 5000 by CySEC. The regulator explained that BD Swiss failed to comply with The Investment Services and Activities and Regulated Markets Law of 2007.

In 2016, BD Swiss was fined an additional EUR 150000 by CySEC for violating the same law that resulted in them being fined the previous year. BD Swiss paid the fine in full.

User friendliness

The BDSwiss website has undergone a much needed facelift to make it more accessible and user friendly. The fact that the platform is mobile friendly is something any trader will appreciate. The website contains well laid out sections that act as a guide through the platform. Traders can access binary options as well as FX/CFDs from a single account and there’s no separate deposit for each. The demo account and learning resources are also user friendly. The only downside is that you need to open an account (provide your details) to gain access. We also like the fact that the platform is available in 19 different languages.

Number of assets and trade types

Any trader will appreciate a binary options broker that offers well over 200 different tradable assets. Once you have an account with BDSwiss, you can easily trade different asset types including indices, stocks, currency pairs and commodities. The platform also offers a handful of trade types which include one-touch, classic high/low, end of day and end of week among others. This gives you more control over how much you can earn on a trade and how much you can risk on single trades.

BDSwiss also provides additional unique features such as rollovers and double-up which allow you to maximize profits or, minimize losses on single trades.

Deposits, withdrawals and fees

The minimum accepted deposit amount s USD/EUR 100. This lies in the mid range and we consider this quite fair. BDSwiss accepts several payment methods including wire transfer, credit card and e-wallet. It’s worth noting that you’ll be required to provide identification documents before your account is active. You can withdraw your earnings through any of the aforementioned payment methods. Depending on the payment method you choose, withdrawn amounts might take up to 7 days to reach you. Withdrawals under $500 will also attract a $25 fee.

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Effective returns

If you opt to trade binary options, the effective return on successful trades can be as high as 85%. How much you actually earn will also depend on the trade type you’re using. For example, if you’re using one-touch, your effective return might be as high as 600%. If trading FX/CFDs, BDSwiss will offer leverages of up to X400 which is quite fair given many brokers will not go over X200.

Contact and support

We really like the fact that BDSwiss customer support is accessible through different channels including email, phone and live chat. The broker has also gone the extra mile to hire multilingual support staff which makes it even easier for traders from across the globe to have their problems resolved fast. Support also extends to how you can learn to trade using the platform. The broker has invested in a variety of webinars some of which allow you to watch successful traders making money.

Website extras

Being able to trade binary options and FX/CFDs from a single account is one feature we particularly like. However, BD Swiss seems to focus a lot on the CFDs. The different trade types, tools and features available also make it easy to maximize profits on winning trades and minimize losses of losing ones. Being registered with the FSA, CySEC and NFA are additional extras that make BD Swiss quite credible. Traders don’t need to worry about losing their investments if the broker winds up.

Overall, despite being around for just over five years,BD Swiss has been able to achieve a lot more than many of its competitors. The broker has built their reputation on a foundation of trust and transparency. Being a fully regulated broker, CySEC assures traders that their money will not be lost simply because the business collapsed. The company’s focus is to help traders make money through buying and selling over 200 assets on the platform. Its easily accessible website is easy to navigate and includes numerous tools which can make your trading life easier. It does lack some common features such as bonuses but make up for this by regularly holding contests and promotions to enable traders earn more. If you’re looking for an online options broker with FX/CFD trading, BD Swiss is worth considering.

Banc de Swiss App

They simply made the app accessible for every device. So if you only have a Android or an iPhone, you can also download there smartphone/tablet application of Banc de Swiss, as well. And yeah, it covers all your assets.

Do You Got Questions

So if you have any questions about Banc de Swiss, please put them below this Review.

We really like to know if you think if there’s anything you can improve on Banc de Swiss. If there’s some features that they’re lacking.

What is Your Experience With Banc de Swiss

Or If you’ve actually tried it, let me know. I’m always wwinterested to see what other people have to say about Banc de Swiss or other different brokers out there. I think this is one of the most trust able brokers out there. Go for safety go for Banc de Swiss.

Banc de Swiss opening a Account

Overall, Banc de Swiss shows a good reputation.

So if you got more interest in the Banc de Swiss Broker. Click the link here down below to the the official website, so you can sign up and check them out yourself.

Also Check our other Binary option broker reviews.

Thank you for visiting and good luck trading.

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